化学合成。
医药合成中间体
合成路线 1(1. 合成:7504-94-1)
产率:99.8%
合成条件:at 100℃; for 0.50 h;
实验步骤:[1484]将2-氯嘧啶(15g,131mmol),NH 2 NH 2 .H 2 O(30ml),K 2 CO 3(15g,109mmol)的混合物在100℃下搅拌30分钟。 将混合物用冰冷却,过滤收集得到的粗结晶。 用冷水洗涤晶体,空气干燥,并从石油醚(150ml)中重结晶,得到化合物350a(14.4g,131mmol,产率:99.8%),为黄色固体。 1H NMR(400mhz,DMSO-d6)δ8.30(d,= 4.8hz,2h),8.12(br s,ih),6.59(t,j = 4.7hz,ih),4.13(s,2h)。
参考文献:
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合成路线 2(2. 合成:7504-94-1)
产率:83%
合成条件:at 20℃; for 3 h;
实验步骤:将2-氯嘧啶(10.04g,87.7mmol)溶于吡啶(200mL)中,并向混合物中加入肼(35.8mL,1.14mol),然后加入吡啶(100mL)。 将混合物搅拌3小时。 然后在室温下浓缩。 将残留物悬浮在水中并过滤。 用冷甲醇洗涤滤饼。 收集粉末并在真空下干燥,得到嘧啶-2-基肼,为白色粉末(8.05g,83%)。
参考文献:
- [1] Patent: WO2008/141020, 2008, A1. Location in patent: Page/Page column 58